/*
 * Copyright (c) 2025 Li Auto Inc. and its affiliates
 * Licensed under the Apache License, Version 2.0(the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <nuttx/config.h>
#include <nuttx/clock.h>
#include <nuttx/irq.h>
#include <sys/types.h>

void up_udelay(uint32_t us)
{
	clock_t start_time = 0;
	clock_t end_time = 0;

	if (0u == us) {
		return;
	}

	up_timer_value(&start_time);
	end_time = start_time + ((clock_t)us * CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC / 1000000);
	while (true) {
		up_timer_value(&start_time);
		if (start_time >= end_time) {
			break;
		}
	}
}